Best Air & Fuel Ratio Gauges of 2025

The AEM X-Series Wideband UEGO Gauge (PN 30-0300) features a large seven-segment center display, which is 87% larger than the previous version. It comes with 0-5v and RS232 Serial Port outputs for feedback control and data logging, and an AEMnet (CANbus) output for data logging. With X-Digital wideband technology, it can read and report values that other controllers cannot, providing optimized engine tuning and safer operation. The gauge's faster response time improves wideband feedback control for a more powerful and accurate tune. Dead time affects the data you see when tuning an engine using wideband AFR feedback control on an inertia dyno.

The Gledewen Air Fuel Gauge features a vibrant 24-color LED display and a central readout that makes it easy for you to monitor your vehicle's air-fuel ratio, lambda, and oxygen percentage. With its advanced technology, this gauge provides real-time feedback on your engine's performance, helping you optimize power while ensuring safety. You can choose between two calibration modes, making it user-friendly for both novices and experts. Plus, its wide compatibility with various vehicle systems allows you to gather valuable data effortlessly.

The GlowShift Black 7 Color Series Digital Wideband Air/Fuel Ratio Gauge is a must-have tool for measuring the air to fuel ratios of gasoline or E85 flex-fuel performance vehicles. With gasoline wideband air/fuel ratio readings from 10.00 to 20.00 AFR and E85 wideband air/fuel ratio readings from 6.00 to 12.00 AFR, this 2-1/16" (52mm) gauge features a black dial, clear lens, and 7-color digital display. The gauge also includes 4.9 LSU wideband oxygen sensor, weld-in bung, control box, and other necessary hardware for installation. The 7 solid color modes & 2 color cycle modes are great for customizing the gauge to match factory dashboard lights or adding a personalized touch to the vehicle's interior.

The CNRAQR Air/Fuel Gauge offers a user-friendly installation experience with its standard 52mm size, allowing you to fit it almost anywhere in your vehicle. It also features a highly adaptable controller box, enabling you to customize connections and settings to match your vehicle's specific needs. This gauge is compatible with various systems, supporting voltages up to 16V. Additionally, the advanced 4.9 LSU sensor provides quick and precise feedback on air/fuel ratios, ensuring you have the information needed to make timely adjustments for optimal engine performance.

The GlowShift AFR Gauge is a vital tool for monitoring the air to fuel ratios in both banks of your performance vehicle's engine. It provides precise readings for gasoline and E85, helping you optimize your engine's performance. With its customizable multi-color LED display, you can easily match the gauge to your vehicle's dashboard or create a unique style. The gauge also features a dimmer function to reduce brightness when your headlights are on, enhancing nighttime visibility. Included in the kit are essential components like oxygen sensors and installation hardware, making setup straightforward and convenient.

The ZHSYMX AFR Gauge Kit features a 2-inch size that fits various instrument pods, making it a versatile choice for your vehicle. Its straightforward installation process means you can set it up easily, without the need for complex calibrations. The included LSU4.9 sensor delivers accurate, real-time air/fuel ratio readings, ensuring you get precise data for optimal engine performance. With its digital wideband technology, this gauge not only measures but also displays your air/fuel ratio efficiently, helping you monitor your engine's health effectively.

The ARTILAURA Air/Fuel Gauge features a clear LCD color screen that makes it easy for you to read the display, even in low light conditions. With a gauge size of 2-1/16 inches, it provides accurate Air/Fuel Ratio readings ranging from 10.00 to 20.00 AFR, helping you monitor your vehicle's performance effectively. This gauge is designed for 12-volt cars and is known for its high sensitivity and simple operation. Additionally, it comes with a narrowband oxygen sensor that ensures precise measurements, enhancing your driving experience and making it easier to maintain optimal fuel efficiency.

The GlowShift AFR Gauge is a vital tool for optimizing the air-to-fuel ratios in your gasoline or E85 FlexFuel vehicle. It provides wideband readings, helping you monitor performance with accuracy. With a sleek 2-1/16" design and a tinted lens, the gauge features seven solid colors and two cycling modes, allowing you to customize the display to match your dashboard. Additionally, it comes complete with an oxygen sensor and all necessary installation components, ensuring a hassle-free setup. Enjoy peace of mind with a one-year warranty and lifetime technical support from GlowShift.

The GoolRC Air Fuel Gauge is a versatile 2-in-1 meter that displays both your vehicle's air-fuel ratio and battery voltage. This dual functionality allows you to monitor essential performance metrics with ease, enhancing your driving experience. Made from durable, high-quality materials, it promises longevity and resistance to wear. Its 52mm size fits a wide range of vehicles, from motorcycles to trucks, making it a practical addition for any gasoline engine. Installation is straightforward, ensuring that you can quickly benefit from improved vehicle performance and safety.

The Auto Meter Ultra-Lite Wide Band Air Fuel Ratio Kit includes a Bosch LSU4.2 sensor with 0.1 AFR resolution, wiring harness, stainless steel bung, mounting hardware, and installation instructions. It has a 0-4v data output feed for ECU, data acquisition unit, or laptop tuning. It is compatible with gasoline-powered engines and has a digital segment display and LED radial bar graph display. It is 12 and 16 volt compatible and can work with nearly every street and race car electrical system.